Belize-born MC Shyne led a Def Jam-sponsored conference call on Wednesday that was broadcast live on XXL magazine’s Ustream. The call was supposed to have included DJs and journalists, but one of Shyne’s musical nemeses, 50 Cent, decided to crash the proceedings.

In a video posted Thursday (August 12) on ThisIs50.com, 50 is seen on the phone claiming to be a radio personality:

“Shawn from Radio One.” Fif then poses the question, “What’s your real issue with 50 Cent?”

50’s call was quickly disconnected and he was blocked from calling back. Later on in the video, though, 50 is seen yelling into the phone, pretending to talk to Shyne, spitting Mel Gibson-eque obscenities and declaring

“you’re on an island. You can’t go to war on an island.”

On Thursday, Shyne, deported last year to his native Belize, responded in a Skype interview with MTV News.

“Wow. That’s like an all-time low,” Shyne said. “I didn’t know he was so desperate. He’s gone from confidential informant, witness-protection program dude, getting order [of protection] on muthaf—as. Now he’s a stalker. I was in shock. He called up saying he was ‘Jamal from Harlem.’ He didn’t call up saying he’s Curtis Jackson, Hawaii 5-0. He’s a busta. I can’t believe it. I can’t believe he would stoop to that low. Then again, a guy in the witness-protection program, he has no shame.”

Shyne said he wasn’t aware that it was 50 who had called in until after he’d finished his interviews.

“You know how it is. When you do these things, you always gotta expect a muthaf—a to call and he might be disgruntled. We took it as another disgruntled person. ‘Cause you know, I don’t know what his voice sounds like. I don’t listen to nothing he do. If we on the yard, and they put his video on, they change the TV in the yard,” Shyne explained, referring to his recently completed prison stint. “I don’t jack that dude on no level. I don’t know what his voice sound like. But somebody at Def Jam caught him. He’s been reaching out to one of my generals in the street begging for peace. He caught his voice too. It was after the fact.

“I thought it was somebody who was having a bad day, who wanted to know the situation. It wasn’t until after everything was finished, muthaf—as at Def Jam was like, ‘That was Boo-Boo. That was Hawaii 5-0.’ I was like, ‘No. No.’ Then he put the out, like he was talking reckless. He’s a creep. Any of my comments have been honest comments. These dudes do anything, I don’t give a f—. It never bothered me. The fact that he’s sitting in New York, selling his Vitamin Water, listening to my Ustream. What the f—? You’re stalking me. Go take some steroids. Find something to do.”

50 Cent could not be reached for comment.